Panasonic SA-PM19E, Service Manual

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6. Handling Precautions For Traverse Deck
The laser diode in the traverse deck (optical pickup) may break down due to potential difference
caused by static electricity of clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
Handling of CD traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to static
electricity as it is extremely sensitive to electrical shock.
2. The short land between the No.4 (LD) and No.5 (GND) pins on the
flexible board (FFC) is shorted with a solder build-up to prevent
damage to the laser diode (Fig 1).
3. Take care not to apply excessive stress to the flexible board (FPC
board).
4. Do not turn the variable resistor (laser power adjustment). It has
already been adjusted.
Fig 1
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